EP0884652B1 - Méthode et appareil de détection de trous dans un matériau de copie - Google Patents

Méthode et appareil de détection de trous dans un matériau de copie Download PDF

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Publication number
EP0884652B1
EP0884652B1 EP98107566A EP98107566A EP0884652B1 EP 0884652 B1 EP0884652 B1 EP 0884652B1 EP 98107566 A EP98107566 A EP 98107566A EP 98107566 A EP98107566 A EP 98107566A EP 0884652 B1 EP0884652 B1 EP 0884652B1
Authority
EP
European Patent Office
Prior art keywords
copy
light
detecting
copy media
time period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98107566A
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German (de)
English (en)
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EP0884652A3 (fr
EP0884652A2 (fr
Inventor
William D. Milillo
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Xerox Corp
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Xerox Corp
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Filing date
Publication date
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Publication of EP0884652A2 publication Critical patent/EP0884652A2/fr
Publication of EP0884652A3 publication Critical patent/EP0884652A3/fr
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6588—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material
    • G03G15/6594—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material characterised by the format or the thickness, e.g. endless forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/512—Marks, e.g. invisible to the human eye; Patterns
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00523—Other special types, e.g. tabbed

Definitions

  • the present invention is directed to a method and apparatus for positioning paper in a feed path.
  • the present invention is directed to a method and apparatus for detecting holes in copy media.
  • the invention allows a registration system to distinguish between a hole and the leading or trailing edge of a copy sheet, to facilitate proper registration of the copy media onto a photoreceptor.
  • the xerographic imaging process begins by charging a photoconductive member to a uniform potential, and then exposing a light image of an original document onto the surface of the photoconductor, either directly or via a digital image driven laser. Exposing the charged photoconductor to light selectively discharges areas of the surface while allowing other areas to remain unchanged, thereby producing an electrostatic latent image of the document on the surface of the photoconductive member. A developer material is then brought into contact with the surface of the photoconductor to transform the latent image into a visible reproduction.
  • the developer material includes toner particles with an electrical polarity opposite that of the photoconductive member, causing them to be naturally drawn to it.
  • a blank copy sheet or other type of copying media is brought into contact with the photoreceptor and the toner particles are transferred thereto by electrostatic charging the media.
  • the copy media is subsequently heated, for permanent affixing of the reproduced image thereto to produce a "hard copy" reproduction of the document or image.
  • the photoconductive member is then cleaned to remove any charge and/or residual developing material from its surface to prepare it for subsequent imaging cycles.
  • Blank copy media of a variety of sizes are typically stored in trays that are mounted at the side of the machine.
  • copy media having the appropriate dimensions is transported from the tray into the paper path just ahead of the photoreceptor.
  • the copy media is then brought in contact with the toner image that is present on the surface of the photoreceptor prior to transfer. If the copy media has not been oriented or registered properly before it is brought in contact with the toner image, the toner image may be fused at an improper location on the copy media, causing it to be skewed or too far up, down, front or back on the page.
  • sensors may be strategically placed at the end the feed path, and their sequence of engagement used to determine whether a transporting copy sheet is skewed and/or laterally mis-aligned. If the sheet is skewed, the velocity of one side of the copy sheet is increased relative to the other side to return the sheet to proper alignment. If the sheet is laterally mis-aligned, the sheet is shifted to the proper lateral position.
  • a device such as this is disclosed in US-A 5,094,442 to Kamprath et al. issued March 10, 1992, which discloses a translational electronic registration (TELER) system.
  • TELER translational electronic registration
  • This system generally includes three optical sensors, a pair of coaxial independently driven drive rolls, a carriage with a linear drive on which paper drive rolls are mounted, and a microprocessor controller.
  • a blank copy media is driven into the nip rolls and moved through the paper path for placement and fusing of an image thereon.
  • the speed of both nip rolls can be controlled to effect skew alignment and longitudinal registration.
  • the nip rollers are mounted on a carriage movable transversely with respect to the feed path.
  • a sensor system controls positioning of the carriage to achieve the desired top edge or a lateral positioning of the copy media. Independent control of nip roll drive and carriage translation provides simultaneous alignment in lateral and longitudinal directions.
  • Copending application Ser. No. (concurrently filed, not yet assigned, our ref. D/97253) to Milillo et al. is another device that may be enhanced with the present invention.
  • Copy media of this type is useful when it is desired to place the printed copies into a looseleaf binder, or at other times when it becomes necessary to have output with punched holes.
  • TE trailing edge
  • LE leading edge
  • EP-A-0363153 discloses an apparatus which determines the location of an edge of an advancing sheet and discriminates between the edge and a hole in the sheet. After the leading edge of the sheet is detected by a sensor (108) and the sheet has moved a first predetermined distance, the absence or presence of the sheet is sensed for a second predetermined distance.
  • US 4540170 discloses a paper feed control device having paper feed rollers for feeding a paper sheet such as an original to a predetermined position, a first sensor for detecting the paper sheet, a second sensor for detecting leading edge and trailing ends of the paper sheet, a microcomputer for controlling the rollers in response to the output signals from the sensors, and a compensating circuit for compensating the level of the output signal from a second sensor which is maintained in a non-detecting state until the paper sheet completely passes through the second sensor.
  • the present invention has a significant advantages over current methods of aligning copy media in a feed path in that it allows the presence of pre-drilled holes in copy media to be detected and insures more accurate alignment of such a copy sheet. In addition, it enables the imaging system to be able to track the presence of holes, to avoid printing over undesirable locations.
  • said first signal is generated when the copy media blocks light emitted from said light source and prevents said emitted light from reaching said light sensing device
  • said second signal is generated when the copy media is not located between said light source and said light sensing device.
  • said designated time period is dependent upon a speed of a leading edge of the copy media as it passes a light sensor, and a distance from a leading edge of the copy media for which it is known that no more holes will be present.
  • said designated time period is determined by dividing said leading edge distance by said copy media velocity. It may also be preferable that said designated time period is dependent upon a speed of a trailing edge of the copy media as passes a light sensor, and a diameter of a largest hole that can be defined by the copy media.
  • said designated time period is determined by dividing said diameter by copy media velocity over said designated distance said diameter.
  • said registration is an electronic registration system.
  • said electronic registration system is a translating electronic registration system.
  • said light source is an LED disposed near said feed path for projecting light toward said feed path.
  • Said light sensing device may be a phototransistor.
  • FIG. 1 depicts an isometric view of a possible layout of the interior of a xerographic copy machine. Relative positions of the platen glass, document, light source, lens, and photoreceptor are shown.
  • FIG. 2 shows a front view of an interior cavity of a photocopy machine.
  • a photoreceptor is shown with latent and developed images shown thereon. The relative positions of the registration, development, transfer, and fusing stations are also shown. The paper path and media storage trays are also shown.
  • FIG. 3 contains an isometric view of a TELER system, one type of electronic drive roll system that may be used with the present invention.
  • FIG. 4 depicts an example sheet of pre-drilled copy media that may be transported through the present invention.
  • FIG. 5 contains a flow chart describing operation of a pre-drilled media algorithm that may be incorporated into the copy registration module of the present invention.
  • the present invention is directed to a method and apparatus for positioning paper in a feed path. Specifically the present invention relates to a method and apparatus detecting holes in copy media thereby allowing a registration system to distinguish between a hole and the leading or trailing edge of a copy sheet, to facilitate proper registration of the copy media onto a photoreceptor.
  • FIG. 1 is used to illustrate an example light lens copying operation which begins by placing the document 60 face down upon the platen glass 62, such that the right edge of the original image is lined up with axis A.
  • Axis B corresponds to the location at which the left edge of document 60 comes in contact with platen glass 62. It should be noted that the left edge of the image will rest at locations further away from or closer to axis A to axes B', B", etc. as documents with differing widths are used.
  • document 60 is exposed to a light source 64, which causes the image thereon to be reflected back toward the copy machine and onto photoreceptor 66. Passage of the light reflected from document 60 through lens 72 causes latent image 68 projected onto photoreceptor 66 to be reversed such that the left edge of document 60 at axis A will be reflected at axis C on the photoreceptor belt. Thus, the left edge axis A of document 60 will become the trailing edge axis B of latent image 68, and will remain so throughout processing.
  • photoreceptor 66 will move latent image 68 in the direction of arrow G. Toner particles are deposited onto it at development station 182, thereby transforming latent image 68 into a developed image 174. Photoreceptor 66 and developed image 174 will then proceed toward transfer station 184.
  • a blank copy media 170 will be removed from one of paper trays 176 and transported along paper path 178.
  • Copy media 170 will pass through nip 180 between two rolls included in registration system 200 end of paper path 178, to be placed in contact with developed image 174 just as it reaches transfer station 184.
  • Copy media 170 with developed image 174 thereon will then move through a pre-fuser transport 186 (not shown) to fusing station 188 (not shown) where the toner image will be permanently affixed to copy media 70.
  • TELER translating electronic registration
  • FIG. 3 TELER system 300 includes a carriage 306 having two drive rolls 202 and 204 which are mounted thereon in rotatable fashion, and are driven by drive motors 206.
  • the roll pairs 202 and 302 engage copy media 170 and drive it through TELER system 300.
  • the system includes optical sensors 312, 314 and 310 which will detect the presence of the edges of copy media 170.
  • Two sensors 312 and 314 are mounted on the carriage 306 adjacent the drive rolls 202 for lead edge detection of the copy media and control of motors 206.
  • the sequence of engagement of the sensors 312 and 314 and the amount of time between each detection is utilized to generate control signals for correcting skew (rotational mis-positioning of the copy media about an axis perpendicular to the copy media) of the copy media by variation in the speed of drive rolls 202.
  • Sensor 310 is arranged to detect the top edge of the copy media and the output therefrom is used to control transverse drive motor 308.
  • said first signal is generated when the copy media blocks light emitted from said light source and prevents said emitted light from reaching said light sensing device
  • said second signal is generated when the copy media is not located between said light source and said light sensing device.
  • said designated time period is dependent upon a speed of copy media as it enters said registration system, and a distance from a leading edge of the copy media for which it is known that holes will be present.
  • said designated time period is determined by dividing said leading edge distance by said copy media velocity. It may also be preferable that said designated time period is dependent upon a speed of copy media as it exits said registration system, and a diameter of a largest hole that will potentially be present upon the copy media.
  • said designated time period is determined by dividing said diameter by copy media velocity over said designated distance said diameter.
  • said registration is an electronic registration system.
  • said electronic registration system is a translating electronic registration system.
  • said light source is an LED disposed near said feed path for projecting light toward said feed path.
  • Said light sensing device may be a phototransistor.
  • the present invention includes a pre-drilled media algorithm which can be used to ensure proper registration of copy media 170 that has pre-drilled holes 402, best illustrated in FIG. 4.
  • sensors can be used to detect the presence of copy media 170 in paper path 178 by measuring the amount of light that reaches a photodetector. These devices can also be used to detect the presence or absence of holes or slots in copy media 170.
  • sensor 404 should be placed in paper path 178 such that copy media 170 moving through the paper path in the direction of arrow J can be detected. As copy media moves past sensor 404, electronic signals 416 are generated in response to the amount of light measured at the photodetector.
  • a "no paper” signal (which may be either an ON/HI/ 1 signal or an OFF/LOW/0 signal depending upon the chosen configuration) is generated when light is being measured at the photodetector, indicating that a hole has been detected, while a "paper” signal (the signal opposite that chosen for the "no paper” signal) is generated while the solid portion of copy media 170 is being transported past sensor 404.
  • a "no paper” signal will also be generated when there is no copy media moving past sensor 404, while an OFF signal will be generated when copy media is moving past sensor 404.
  • sensor 404 To discriminate between the leading edge 412 of a sheet and the back edge of a hole 402 upon receiving a transition from a no paper signal to a paper signal must be added. Similarly, sensor 404 must be able to distinguish the trailing edge 414 of copy media 170 from the front of a hole 402 when a transition from a paper signal to a no paper signal occurs.
  • sensor 404 detects a transition from no paper to paper at block 502, indicating a leading edge (LE) of a sheet of new copy media 170, or the back of a hole 402 is passing sensor 404.
  • block 504 is active for a designated period of time. The length of this designated time period must be chosen by considering the speed of the copy machine, and the possible locations of any holes that might be present in copy media.
  • holes in copy media lie within 3/4 in from the leading edge. However, it is not unusual for holes to lie further from the leading edge, or for consecutive holes to be placed next to each other, such that there is at least one hole further than 3/4 inch from the leading edge. On the other hand, it is rare that a hole will lie in or near the middle of a page. Thus, the designated time period must simply be long enough to allow the leading edge of the copy media to pass a comfortable distance away from sensor 404, so that it will be clear that the sensor is reading light reflected from the center of the copy media.
  • the length of time that should elapse once a no paper to paper signal transition occurs should be determined by dividing the distance the copy media must travel to ensure that no holes will be present, by the velocity of the sheet as it passes over the sensing device.
  • the speed of copy media 170 as it enters nip 180 is known to be 1000 mm/s, while it is known that no holes will lie more than 100 mm from the leading edge of copy media 170.
  • the designated time period is approximately 100 ms.
  • a paper to no paper signal transition has not occurred within the designated time period, a LE with no holes has been detected by sensor 404 as shown in block 506.
  • a transition from a paper signal to a no paper signal within the designated time period X indicates that a hole lies within the allocated distance from the LE of copy media 170, as indicated in block 508.
  • An electronic registration system cannot function properly without a mechanism which accurately detects the leading and trailing edges of copy media.
  • Information about the location of pre-existing holes can also be used by the imaging system of the printing machine to shift the location of the image so information will not be printed over a hole in the copy media.
  • the presence of holes at the trailing edge (TE) of a copy sheet must also be detected, however the process for detecting holes at this end of the page must be slightly different.
  • this consideration is being made while a paper signal is already being transmitted from sensor 404. Once a paper to no paper transition occurs as indicated in block 510, the sensor must determine whether or not subsequent no paper to paper transition occurs within a designated time period y as indicated in block 512. Again, this time period must be altered as print speed and hold diameter are changed. However, the length of the time period is chosen by considering the speed of the copy machine, and the largest possible diameter size for any holes that might be present in copy media.
  • the designated time period is chosen by considering the largest possible diameter of a hole that will lie near the trailing edge of the copy media. Once the speed at which the copy media 170 exits nip 180 is known, the designated time period should be equal to the amount of time that it will take for the diameter distance to move past the sensor at the known copy speed. In the embodiment described above, it is also known that no holes larger than 10 mm will ever be present on a page.
  • the speed of exiting speed of copy media 170 is 480 mm/s. Under these circumstances 20 ms is the approximate time period that will elapse. If a no paper to paper transition does not occur within the given time period, the TE of copy media 170 has been detected as indicated in block 514. the presence of a no paper to paper signal transition indicates that a hole lies in the margin next to the trailing edge of the page as shown in block 516.
  • the system can automatically be reset as another sheet of copy media 170 is fed from paper tray 176.
  • the information regarding the presence or absence of holes in the margins of copy media 170 can be used for many purposes, including transmitting signals to the imaging system in order to prevent the latent image from being generated in locations on photoreceptor 66 that will correspond to areas on copy media 170 that will contain holes. Also the use of sensors to accurately detect copy media edges is critical to the functioning of an electronic registration system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Claims (10)

  1. Appareil destiné à détecter la présence de trous préexistants dans un matériau de copie (170), comprenant :
    a) un moyen de transport de matériau de copie destiné à déplacer le matériau de copie selon un chemin (178) ;
    b) un système de repérage (200) destiné à placer le matériau de copie en un emplacement désigné à une extrémité dudit chemin ;
    c) un microprocesseur, communiquant avec ledit système de repérage de manière à ajuster un emplacement auquel le matériau de copie est placé à ladite extrémité de chemin ;
    d) une source de lumière, située le long dudit chemin ;
    e) un dispositif (404) de captage de lumière en relation de réception avec ladite source de lumière, destiné à capter une intensité lumineuse issue de ladite source de lumière, et à générer des signaux (416) indicatifs de ladite intensité lumineuse captée, ladite intensité lumineuse captée comprenant un premier signal généré quand aucune lumière n'est captée si un matériau de copie bloque la lumière émise par la source de lumière, et un deuxième signal généré quand de la lumière est captée et générée si le matériau de copie n'est pas placé entre la source de lumière et le dispositif de captage ; et
    f) un dispositif de détection destiné à recevoir lesdits signaux générés par ledit dispositif de captage de lumière et à transmettre les signaux à un dispositif de synchronisation en des points en lesquels se trouve une transition des signaux générés entre ledit premier signal et ledit deuxième signal ;
    g) le dispositif de synchronisation est adapté à compter une valeur du temps qui s'écoule après que se soit produite une transition correspondant à un bord d'attaque du matériau de copie, et à transmettre un signal d'horloge audit microprocesseur quand une période de temps indiquée s'est écoulée,
       au moyen de quoi la période de temps indiquée commence, quand se produit la transition correspondant à un bord d'attaque, le dispositif (404) de captage de lumière et le dispositif de détection étant actifs pendant la période indiquée,
       au moyen de quoi on détecte un trou si le dispositif de détection détecte des transitions pendant la période de temps indiquée.
  2. Appareil destiné à détecter la présence de trous préexistants selon la revendication 1, dans lequel le microprocesseur est adapté à déterminer la période de temps indiquée à partir d'une vitesse d'un bord d'attaque du matériau de copie quand il passe ledit dispositif de captage de lumière, et une distance à partir dudit bord d'attaque pour laquelle on sait que des trous ne seront plus présents.
  3. Appareil destiné à détecter la présence de trous préexistants selon la revendication 2, dans lequel le microprocesseur est adapté à déterminer la période de temps indiquée en divisant ladite distance à partir dudit bord d'attaque par ladite vitesse du bord d'attaque.
  4. Appareil destiné à détecter la présence de trous préexistants selon l'une quelconque des revendications 1 à 3, dans lequel le microprocesseur est adapté à déterminer la période de temps indiquée à partir d'une vitesse d'un bord de fuite du matériau de copie quand il passe ledit dispositif de captage de lumière, et un diamètre d'un trou le plus grand que le matériau de copie peut définir.
  5. Appareil destiné à détecter la présence de trous préexistants selon l'une quelconque des revendications 1 à 4, dans lequel le microprocesseur est adapté à déterminer la période de temps indiquée en divisant ledit diamètre par ladite vitesse du bord de fuite.
  6. Appareil destiné à détecter la présence de trous préexistants selon l'une quelconque des revendications 1 à 5, dans lequel ledit repérage (200) est un système de repérage électronique.
  7. Appareil destiné à détecter la présence de trous préexistants selon la revendication 6, dans lequel ledit système de repérage électronique est un système (300) de repérage électronique par translation.
  8. Appareil destiné à détecter la présence de trous préexistants selon l'une quelconque des revendications 1 à 7, dans lequel ladite source de lumière est une diode électroluminescente (LED) disposée près dudit chemin d'alimentation de manière à projeter la lumière en direction dudit chemin d'alimentation.
  9. Appareil destiné à détecter la présence de trous préexistants selon l'une quelconque des revendications 1 à 8, dans lequel ledit dispositif de captage de lumière est un phototransistor.
  10. Procédé destiné à détecter la présence de trous préexistants dans un matériau de copie, comprenant les étapes consistant à :
    a) mesurer une quantité de lumière émise par une source de lumière qui est adjacente à un chemin (178) de matériau de copie et qui se propage selon un chemin qu'un matériau de copie peut interrompre, afin de déterminer si un matériau de copie est présent ;
    b) générer des signaux électroniques (416) en réponse à une quantité de lumière mesurée ;
    c) détecter des transitions entre les signaux générés quand on détecte de la lumière indiquant qu'aucun matériau de copie n'est placé entre la source de lumière et un dispositif capteur et qu'on génère des signaux si on ne détecte pas de lumière, indiquant qu'un matériau de copie (170) est placé entre la source de lumière et un dispositif capteur ; et
    d) détecter les transitions pendant une période de temps indiquée, qui commence après une transition correspondant à la détection d'un bord d'attaque du matériau de copie, au moyen de quoi on détecte des trous si des transitions se produisent pendant la période de temps indiquée.
EP98107566A 1997-06-13 1998-04-23 Méthode et appareil de détection de trous dans un matériau de copie Expired - Lifetime EP0884652B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US876173 1997-06-13
US08/876,173 US5831741A (en) 1997-06-13 1997-06-13 Method and apparatus for detecting holes in copy media

Publications (3)

Publication Number Publication Date
EP0884652A2 EP0884652A2 (fr) 1998-12-16
EP0884652A3 EP0884652A3 (fr) 1999-12-15
EP0884652B1 true EP0884652B1 (fr) 2004-04-28

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US (1) US5831741A (fr)
EP (1) EP0884652B1 (fr)
JP (1) JPH1172981A (fr)
BR (1) BR9801785A (fr)
DE (1) DE69823419T2 (fr)

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WO2016092706A1 (fr) * 2014-12-12 2016-06-16 富士機械製造株式会社 Appareil et procédé de détection automatique de ruban
JP7247029B2 (ja) * 2019-06-26 2023-03-28 シャープ株式会社 用紙搬送装置

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Also Published As

Publication number Publication date
EP0884652A3 (fr) 1999-12-15
EP0884652A2 (fr) 1998-12-16
BR9801785A (pt) 1999-06-15
JPH1172981A (ja) 1999-03-16
DE69823419D1 (de) 2004-06-03
DE69823419T2 (de) 2004-09-02
US5831741A (en) 1998-11-03

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